Marble-polishing machine.



PATENTED FEB. 12, 1907,

J. R. BEIRGELV MARBLE POLISHING MACHINE.

APPLIOATION FILED JUNE 4, 1906.

INVENTOR:

By Altai m s,

JOHN ROYDEN' PEIRCE, OF NEW YORK, N. Y.

IVIA RB LE-POLISHING MACHINE.

Specification of Letters Patent.

Patented Feb. 12, 1907-."

Applioationfiled June 4, 1906. Serial No. 319.976.

To all whom it may concern:

Be it known that I, J OHN RoYDEN PEIROE, a citizen of the United States residing in the borough of Manhattan, city, county, and State of New York, have invented certain new and useful Improvements in Marble- Polishing Machines, of which the following is a specification.

- stone to be polished.

The tool is of that class in which the olishing material is a fixed part of the too in contradistinction to tools which serve only to rub loose sand or other material between the tool and the face of the stone. The material is so arranged in its holder that practically all of it maybe usedbefore the head (in which term I include the holder and the polishing material together) is discarded. The head is designed to be attached instantaneously to a shaft for rotating it.

Other advantages are referred to in detail hereinafter.

The accompanying drawings illustrate an embodiment of the invention.

. Figure 1 is a perspective view' of a head, showing the working-face of the material. Fig. 2 is a vertical section showing the head connected to a shaft. Fig. 3 is a plan of the head. Fig. 4 is an under side View of the metal plate, and Fig. 5 is aperspective viewof one of the sections of polishing material.

Referring to the embodiments of the invention illustrated, the polishing material as, for example, alundumis formed in sections A, having a flat bottom face for olishing and preferably also a flat to face or fastening to a metal plate B. T e sections A are of such size that a number of them may be arranged on'the under face of the plate B in the manner shown in 1, so as to form a substantially complete ring with a large central hole 0 and with radial assages D between the several sections and extending throughout the height of the polishing material. The under side of the plate B is pref erab'ly provided with slight radial ribs E-aruzl' circumferential ribs F and G, which outline pockets into which the sections A of polishing 6o material are to set. The prime function of: the ribs E, F, and G is merely toaccurately; determine the location of the sections of olishing material, and they are made only. esp. enough for this purpose. The sections-arse 5 fastened to the plate B by means of any suit-=- able cementing medium, such as shellac N;

The upper face of the plate B is providedp as shown m Fig. 3, with a number of ribsl-L. the sockets between which are adaptedto 7o receive the'teeth J of the base K, which isroe tated by the shaft L through a; ball-and socket joint M. The shaft L and base K,- as well as the plate B, are centrally aperturedcorresponding to the central aperture-(10f the polishing material. This construction-'- provides a number of cutting edges of the polishing material, in front of which are clear spaces D for carrying a supply of water. The central opening 0 is so large compared'with the outer diameter of the wheel as to make the linear velocity of the outer edge not much greaterthan that of the inner edge,

, and thus to maintain an approximately umform rate of wear of the abrading material and a substantially even working face. The water-supply is maintained over substantially the entire face of the tool from the center-to the outer edge, and numerous experiments have confirmed the increased efli- 9o ciency of the tool due to-the assages D. These passages are maintained y reason of the peculiar construction adopted until the last bit of polishing material is worn away. Water is introduced in large quantity 5 through the hollow shaft L, as indicated by the arrow.

,T he ribs H alternate in position with the underneath ribs E, so as to stiffen. the late around its entire length and to perm t of casting the plate very thin and light.

' W hile the ribs F and G serve only to locate the sections, the radial ribs E have an additional function in bracing the sections against the tangential strains occurring in use, and lo 5 thus relieve the shellac from such strainsat least to a great extent. Without these ribs or some equivalent device it is doubtful if the shellac would be suificientfor practical service. 1

Though I have described with great particulari'ty of detail certain specific embodi- IIO derstood thereform that the invention is restricted to the exact embodiments disclosed.

Various modifications in detail and in the arrangement and combination of the parts may be made by those skilled in the art without departure from the invention.

What I claim is- 1. A tool for polishing marble or the like, including in combination a number of sections A of fixed polishing material, and a common metallic plate B having a central 0 ening, said sections A being cemented to t e under face of the plate B in such positions as to leave passages D between them, and a central opening 0 communicating with said passages and with the central opening in the plate, said plate having ribs E 1* and G on its under face projecting only sufliciently to determine thelocation of the sections of polish ing material, so that said sections are separated from each other and their vertical faces are exposed throughout substantially their entire depth, whereby the face of the tool is provided with a number of cutting edges in front of which are clear spaces for a carrying a supply of water for keeping the marble cool, and which edges are automatically maintained operative throughout the entire usable depth of the tool.

2. A toolfor polishing marble or the like,

including in combination a number of sections A of fixed polishing material, and a common metallic plate B having a central 0 ening, said sections A being cemented to t e under face of the plate B in such ositions as to leave passages D between t em, and a central opening 0 communicating with said passages and with the central opening in the plate, said plate having ribs E F and G on its under face rojecting only sufficiently to determine the ocation of the sections of polishing material, so that said sections are separated from each other and their vertical faces are exposed throughout substantially their-entire depth, whereby the face of the tool is provided with a number of cutting edges in front of which are clear spaces for carrying a supply of Water for keeping the marble cool, and which edges are automatically maintained 0 erative throughout the entire usable depth of the tool, said plate having also radial ribs H on its upper face forming between them sockets for receiving the teeth of a rotating driving member.

In witness whereof I have hereunto signed my name in the presence of'two subscribing witnesses.

' JOHN ROYDEN PEIRCE.

Witnesses: A

DOMINGO A. USINA, THEODORE T. SNELL. 

